Superconductors are materials that have the ability to transport electricity without any energy loss, a property that makes them highly attractive for energy-efficient electronics and emerging quantum technologies.
However, their use outside of the laboratory has been limited by two challenges: the need for extremely low operating temperatures and a tendency to lose their superconducting state when exposed to strong magnetic fields.
Now, researchers at Chalmers University of Technology have found a way to address both of these obstacles. The team carefully shaped the surface where superconducting material is grown, improving its performance at higher temperatures, and preserving its stability in strong magnetic fields.
Their results, published in Nature Communications, point to a new design strategy that could help move superconducting technologies from the lab into practical use.
Persistent Challenges
Modern digital infrastructure, such as data centers and communication networks, consumes substantial amounts of electricity. Conventional electronic systems lose energy as heat, but superconductors could prevent these losses entirely.
Most superconductors only function at extremely low temperatures close to –200°C. Keeping materials this cold requires complex cooling systems, which makes it hard to use them widely. Strong magnetic fields, common in advanced electronics, can also disrupt or destroy superconductivity.
These combined limitations have made it challenging to translate superconducting materials from experimental settings into practical technologies.
Shaping the Surface
Instead of altering the chemical makeup of superconducting materials, the Chalmers researchers took a different approach. They turned their attention to the interface where the superconducting film meets its supporting surface.
The team worked with a copper-oxide compound from the cuprate family, a group already recognized for its relatively high superconducting temperatures. However, once scientists fabricate these materials, they cannot easily alter them. To address this, the researchers focused on engineering the substrate itself.
“By sculpting the surface that the superconductor rests on, we were able to induce superconductivity at significantly higher temperatures than previously possible,” said Floriana Lombardi, lead author of the study.
Guiding Atoms and Electrons
This patterned surface affected how atoms in the superconducting layer organized themselves as the material grew. Essentially, the substrate served as a template, shaping the superconductor’s atomic structure.
“By changing the surface design of the substrate, we were able to influence the superconducting properties and ensure they were preserved, even at higher temperatures and when high magnetic fields were applied,” said researcher Eric Wahlberg.
The surface set up a unique electronic environment at the boundary between the two layers. This region helped align electron motion, stabilizing and strengthening superconductivity. As a result, the material maintained its superconducting state even under conditions that would normally degrade its performance.
Toward Practical Superconductors
The study presents a new way to design energy-efficient superconducting materials. “Instead of searching for entirely new materials or manipulating the chemical properties of existing ones, we are now showing how superconductivity can be enhanced by sculpting the substrate,” Lombardi said.
This strategy could open new possibilities for developing energy-efficient superconductors that function at higher temperatures and remain stable in challenging environments. If researchers improve these materials and produce them at scale, they could help cut energy losses in power grids, electronics, and data systems. Superconductors could also play a large role in quantum computing and other advanced technologies that rely on magnetic fields.
“This shows that very small changes at the nanoscale can have decisive effects and may even unlock the full potential of superconductivity in future electronics,” Lombardi concluded.
Austin Burgess is a writer and researcher with a background in sales, marketing, and data analytics. He holds a Master of Business Administration, a Bachelor of Science in Business Administration, and a Data Analytics certification. His work combines analytical training with a focus on emerging science, aerospace, and astronomical research.